Ononot — For a full-rank 3 \times 2 matrix A, the reduced QR decompos

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Matriceshard

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For a full-rank $3 \times 2$ matrix $A$ , the reduced QR decomposition is $A = QR$ where $Q$ is $3 \times 2$ with orthonormal columns and $R$ is $2 \times 2$ upper triangular with positive diagonal entries. Which statement is FALSE?